5R or 4R

I built 2 customers 2 guns just alike except for the barrel. One was a 4r the other a 5R. These guns are chamberd in 7/300 wsm. The 4r would shoot the 160 Accubonds, the 5R would not. Has any one had trouble getting the accubonds shooting in a 5R. Both would shoot the 180 Bergers or the 168 Bergers. The 168's were a one hole group, the accubonds were 1 1/2 inch at least. Just thought I like to here if anyone else had this problem. Dan

The barrels were the same twist, 5 contour,fluted,finished at 26 inches. They were a different mfg. I did all the load work shooting etc. The 4R was a little faster than the 5R. The guns had the same Stocks, Action, Trigger, Bipod etc. The only differance was the brand of barrel. Loads were developed for each rifle. Dan